大约有 11,643 项符合查询结果（耗时：0.0149秒） [XML]
Why is @autoreleasepool still needed with ARC?
...ed that Objective-C's memory administration (all the retains and releases, etc.) can be fully automatized at compile time. This is, just by reading the code, even before it is run! :)
In order to do so there is only one condition: We MUST follow the rules, otherwise the compiler would not be able t...
Get an object properties list in Objective-C
... needs a little extra to handle primitives, like int, long, float, double, etc.
I built off of his to add this functionality.
// PropertyUtil.h
#import
@interface PropertyUtil : NSObject
+ (NSDictionary *)classPropsFor:(Class)klass;
@end
// PropertyUtil.m
#import "PropertyUtil.h"
#import "ob...
Are there any downsides to passing structs by value in C, rather than passing a pointer?
...cc on x86_64. Anyone is welcome to add other architectures like MSVC, ARM, etc.)
Let's have our example program:
// foo.c
typedef struct
{
double x, y;
} point;
void give_two_doubles(double * x, double * y)
{
*x = 1.0;
*y = 2.0;
}
point give_point()
{
point a = {1.0, 2.0};
r...
How to simulate Android killing my process
... is in the background and the OS decides it needs the resources (RAM, CPU, etc.). I need to be able to simulate this behaviour during testing so that I can ensure that my application is behaving correctly. I want to be able to do this in an automated way so that I can test if the application behaves...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
12. 一个验证passwd文件有效性的例子
$ cat /etc/passwd | awk -F: '\ NF != 7{\ printf("line %d,does not have 7 fields:%s\n",NR,$0)}\ $1 !~ /[A-Za-z0-9]/{printf("line %d,non alpha and numeric user id:%d: %s\n,NR,$0)}\ $2 == "*" {printf("line %d, no password: %s\n",NR,$0)}'...
How to quit a java app from within the program
..., as is usual for applications with a graphical user interface (AWT, Swing etc.). For these applications, you either find a way to end the GUI event loop (don't know if that is possible with the AWT or Swing), or invoke System.exit().
...
What is the purpose of willSet and didSet in Swift?
...stored property.
This is useful for sending notifications, synchronisation etc... (see example below)
Example 5. Concrete Example - ViewController Container
//Underlying instance variable (would ideally be private)
var _childVC : UIViewController? {
willSet {
//REMOVE OLD VC
pr...
Entity Framework is Too Slow. What are my options? [closed]
...k at the SQL generated, use debuggers, pre-compile, take many extra steps, etc. i.e. waste a lot of time. No one says - Simplify! Everyone wants to comlicate things further by taking even more steps (wasting time).
A common sense approach would be not to use EF or LINQ at all. Use plain SQL. Th...
How do you set EditText to only accept numeric values in Android?
... I needed it in order to prevent users from typing operators, parentheses, etc. on the number pad. What a life saver, man! Welcome to Costco; I love you!
– gonzobrains
Jul 23 '14 at 23:38
...
How to map with index in Ruby?
...in 1.8.7+), which mixes in Enumerable, so you can call map, select, reject etc. on it just like on an array, hash, range etc.
– sepp2k
Jan 15 '11 at 1:45
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